Abstract
We investigate the electrical properties of Ti/Al ohmic contacts on (NH4)2Sx-passivated N-face n-GaN:Si (4.2× 1018 cm-3) grown by molecular beam epitaxy. It is shown that the passivation results in an increase in the photoluminescence intensity of n-GaN. Current-voltage (I-V) measurements show that the passivated samples experience a slight degradation in the electrical properties upon annealing at 300°C, while the untreated samples show some improvement although still nonohmic. Based on the I-V and X-ray photoemission spectroscopy results, we describe the possible mechanisms for the passivation and annealing dependence of the electrical properties of the Ti/Al contacts to the N-face n-GaN.
Original language | English |
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Pages (from-to) | H275-H277 |
Journal | Electrochemical and Solid-State Letters |
Volume | 12 |
Issue number | 7 |
DOIs | |
Publication status | Published - 2009 |
ASJC Scopus subject areas
- Chemical Engineering(all)
- Materials Science(all)
- Physical and Theoretical Chemistry
- Electrochemistry
- Electrical and Electronic Engineering